You are given a 2D matrix grid of size m x n, where each cell can either be a land cell (represented by 0) or a water cell (represented by a positive integer indicating the number of fish present in that cell). A fisher can start at any water cell and perform two operations any number of times: catch all the fish in the current cell or move to an adjacent water cell. Your task is to determine the maximum number of fish the fisher can catch if they start at the optimal water cell.
You are given a graph with n vertices, numbered from 0 to n-1. The graph contains undirected edges described in a 2D array edges, where each element edges[i] = [ai, bi] indicates that there is an undirected edge between vertices ai and bi. A connected component is a subgraph in which there is a path between any two vertices, and no vertex is connected to vertices outside of the subgraph. A connected component is said to be complete if there is an edge between every pair of vertices in that component. Your task is to return the number of complete connected components in the graph.